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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc9f481c3c33fe9ad4ce933fa5f05971c021c16fe88c2f35df272edd2aeee0e' 
  AND token = 'mhqR0HkyN3qw8TWNB3uibj7ZGtLDiz/N3xjs7jTVD30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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