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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a817da1c19ce92a1d68de54b9f14c56a9919f986c1fc28b0d8518f0a783c38df' 
  AND token = 'y+aMlnrY74eouekedm/VXnWvnbrJXbisD/aGOMzWJus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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