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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e5548fcf55d338c0677042ccda8c4ae628af5b447e54380e11202c4dd58a61' 
  AND token = 'EIjOACQYz39W+1UMetuIAOo30+mnOJ0NUSoMXG+2wYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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