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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8cc22f6ae1cf798172de38ec07ae98247791cf0095ac5ea236aa17a65f72c92' 
  AND token = 'Q9nfoN7diu0POKRlxU53uXX8f4vhRRDDFW/pntlH0pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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