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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6937c4a685bcb79dadbb6ba994996d100e1fb088ea65d6f80da7b3e0b005d3b' 
  AND token = 'H/CYin34iFZEQ4aRlJykiSHl8tt7oVrbUKEcDsf6QwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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