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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512acd74e79ff1990cb920195e85f0946571479568459ca8bf8eba31d270e464' 
  AND token = '020s4idGhgKts3XkKqC1aPkFA+uD2EcWjk9p1siLYc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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