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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084054bed0bceeb5d8d0bee4b30488360916fb45bbb0f9c2e0d0c7115d0138d1' 
  AND token = 'XtxME8ECpHcjFQo2iep4OFYCg53a4HbsfiqgDKvH4u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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