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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a787c9b106c7251e92c2c902447c1a9b7ef6d70d689c75acc5a2d2252b81848b' 
  AND token = 'q3/o1wCCi99FSVt83o7Nvey6KjTvVgTij2zQtbHtE1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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