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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2a65be40eb74dc8b271fa11c46b1fa85f97c64ad1175e9ba26dfe3062e8c90' 
  AND token = 'uA8I8WUjH5WazzaCIgtLuPd7AHUZsZQ0bfPfhKxp1zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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