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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38090add9e87a8c9502758e80fbbd73644e3fd0a0f24a2cd5836dd52a6d650e3' 
  AND token = 'zEWEZFHE+fSIs9SUeIx89rseTLHtftix56xlrFjURig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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