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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e214be56ec1ce8b923d642928b0346c788ec589bffcc7e9a3abc5ddc99172cea' 
  AND token = 'HJwpRYOEOyEqKPdHfkZIPTb0qxor+0iD6G8655JTG10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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