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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6284be6ed0b733378c493fd2fdb8a9c7469fc732e33f0f32f2eebf292606054c' 
  AND token = 'BGA0M94cA76kC6ylK0y1L0cMl1p0EoDC866k/F5R+eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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