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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35902c3029d60ec0224007b2192f228a2f0a50f25b91866d1d38937b623a3932' 
  AND token = 'LzUh1RWXJTM7YcE/gzgoSHecV46+WXXt8waCXG0MH5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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