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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb334ce30e721cba10b10639c31fd521a25d9f5abdfecb0969e7ef00b6f479c' 
  AND token = 'BK1vO58Dhn32VF2eVhol5brleswcWLlhUbcnWWxdRy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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