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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1eacf74d2de0aeab8465183a2c700c157fb4d2022c1a24ecbc8598fe5d4ea8a' 
  AND token = 'eyb2R7Wvp/rgJ8FuVBZ0QM4Ppo7oZSUl4ecz4M/E5cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}