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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a381050e764688e01751bc62aa6855000ea2a0660db1fadb1ebb6d426083b37' 
  AND token = 'p1B7akLCFAbRtmhW7K6CUHQxe4I9Nfxg159X2KaD9ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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