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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40db597dc8521fcf4f2cf30f6184779d8a7be9fc1d1888417b8708923fd21967' 
  AND token = 'H4d9asfAbA2x2v51jGhiRWXdD1Dx+J7ykq5PQqoE0yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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