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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6b7bc9b74e196451486ab81f06f2f29b5d74b5d6182845251c18fa7788c6d4' 
  AND token = 'k5xrfpE+m85o6wSaspY8Yd8epFU8i0LDECtwi5JQNBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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