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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ce7a0880e9bd3644a3abe4e4f6f2093d32048297d006ab2ea7a00691e44eac6' 
  AND token = 'jPA9tBx/vmOJIo6MQu8ehPjrFO/Ej2GTi7vdra4exTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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