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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7421fe3a6c8cb99d19526b185921f5a5441ddcb20f4dea92de92a16c17aa78b' 
  AND token = 'Dw7klus4jAax7eL1eauKgEUoUw3jfU5oQYs2Il7xxWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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