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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb877e12d5e88ebf03801099b2e0ab1a3d8b00b3afc31dccc67a76f11eb02b8b' 
  AND token = 'EjeGBFdfVLDwJZHKQxW9ObgPoWYQn1rTbYgCcqtIpsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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