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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcac0f928f239e3bacc45ce841ae66b339547567e0cca2e243c2dc779caca70a' 
  AND token = '759G+RlFbq539qr1rIRxh4pC2K5AYC1j15T/CXt2NfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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