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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7079df266966655b68afd310611694c36a27e67975e8531f820693ad7448f42' 
  AND token = 'YJyrpyyTr052TkOAMscSAJYbUkKxN5RjSLDuzhDN3i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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