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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2912f19643c3a051c9c4d1e97ae2e09def5e840886419c20179cab2455a6243a' 
  AND token = '7JGpGtppiS+kNJJsmZKEAvy0yEWK97X+B5dAFSSeO6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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