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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c833ebe19b7c64cde3738c1ecda92c8bc10b9c000e4e2ad882667c725263ba35' 
  AND token = 'Dkn7X39irwslxI0eEoFaqrnMNeAA7XVgwcvdJWLhCI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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