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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b59db2a8d3d3d88e501942aa35806f666ac1c8b8d2c930f79e7c95331b356552' 
  AND token = 'ilhpReLfozBitMmXBgBqQiNu2iF8GefapCwWiGGkWlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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