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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ca4f24add96f3a50e78c082d913f10a08abf7a36964b034b1518da3c20abd0' 
  AND token = '50lcXnbgYvmgU8xEnBQKolOKmJvJ8ZZfxsraehpdbLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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