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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f1a360eafab484b99adde37ad0ccbe9e6e5579017c76eedc0396ec86ef7f959' 
  AND token = 'dBVm53iL0kZ69Ho3w8eo+JdAoIrJ//i8YqbMJSyLn3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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