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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47214ea7fe40e8b885f642a6f710f18706172b13df6407d1c510563cfc1f33d6' 
  AND token = 'jXTQWLRY28IKiOnlCbwLGAm4M0qd3kKDz9tJFsoPys0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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