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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcac7a4e894d9860a7e36778f98800da8db9e7e770861b8f87ff77b895fa0a85' 
  AND token = 'lEX0VQUAMbAGt1JLHzvIr9ro0eZcuu+ocR6RDRUGG1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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