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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '729da00f669378c2dc223bbfe03e9ba3f2195b01f3105423c019adc662567f60' 
  AND token = 'PX+KOJvjWx+Z87KrEfv5dqrZf8zOmf0jeIX53FdT4q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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