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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4523dc51a964f2a053049fdfd776e166b0298db63b44c1b3db93780528ff0e7e' 
  AND token = '7xRX90iTs/YWAj1sp11o6dG0S7Fi9i3Mzcq7S1D77cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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