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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '871a22b1e0c37dd5ab5e8000fdb7d18ce9e1041f6d9cab234253a31e71ceb8a5' 
  AND token = 'of43RgOQbuFlOJupm7L38sy5Q7WNl8/AaSnA0fVAvbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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