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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf18741a8ff91f75cf86d72bd549c512e8bdb95e865603464b614940b985ce8' 
  AND token = 'riGme+NNFR1xp/TXEywe5DG0yMOJr1YoUnYu1ZAp7Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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