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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2cdfa42c5a4c4de8ea772f485a48e4924b15e02cceaa01c25b1d3006a01aa25' 
  AND token = 'OW/lKUJaux8WxH7VaWZJV3T25D5g8KroFWcQhiOGTog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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