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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daba22a7cad8aab716e3c5deb1379d94d2bdf1f3c177b80e572573b7d9e4c58a' 
  AND token = 'D6dHciyXI9u07v7irKpujW1lec3DTjwUKEh+T0XtKTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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