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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c254648f697a5509c0b7fdf54c6dab1cf97fea88956578dd069c3c3656386676' 
  AND token = '3CNvW4rU87i2JcuuNQL+wChtUbEgNdrHqUckr1S4/4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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