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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2ef5cb086377281662e517be31a09c8712a4a2bd5c2129c8a0a5a912c9f74b' 
  AND token = 'nZQke0mbYicF/aIFtSccgwdJ5ujDMuahKC4GU6PX2cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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