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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43f00a7ab8afd9532f52bf0f42a996abbf509730d7f4431b6152bc25b2eca1fa' 
  AND token = 'flfYcHNzNkQY2Tyr+oFy7UZL7cPqvpn6fLic7R3odaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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