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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55cb3a5c7f5c060d27138136972286497545771d3c786ec701348b93086d563d' 
  AND token = 'SMB6ag55Nq/hQAL09Znf1H7spanQT1vsRWwJ9sehZKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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