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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d5ddf38e9d058a42008cdd01e8dc73b9a59559f5958a6507aa2c512ff8ec02' 
  AND token = 'CcnjY0zwrfAGz4iJATEaOhGVcRpx0cUSAvNFlsXfKk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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