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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c045f1b031ba96ecabc5e091a9955bf90cb26e29908143855e3591a5116eb29' 
  AND token = '/SjcNb5Vpc1iCMUGokMlbz6qYpCocpiIsRuIHjj9qGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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