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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a018ddf62f086524e509d2ad760a0cb62b914e6a81c5b50d29ddd73815b84a1' 
  AND token = 'b3XB96OJuFz5HhiX5kIKq9McWTl3kJOTD5JMl64W6CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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