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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90bc595cd4c3da497c55292205eaecfbf20c751715b3de2db4439f62e0170ed9' 
  AND token = 'eTzolHjHpqdurafC4OH4tjt6Ct/C8gNG9WMC02sN4jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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