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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fbdcdbba08ab580341a0a8b19a68621dc049297d713c20e95c96d468dc040bd' 
  AND token = 'Jy6IV85KKbvAF7CHY40nKN6al8HnNka1XgKiKRXkZEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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