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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca2bbfd6d04edf31a6695fa7b7bd53c0eae8460094ced2d60292e20d8e7d76ba' 
  AND token = 'yjGfb9wUr/Zsukdb1GBpfpIGnNyzArL+AqepfR0TWhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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