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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899cd16f77a7f6de305b683a8710532edf8e9b238a568ddbac0ce3daf5f30ce8' 
  AND token = 'vY08svK0NdXn3M3KnGaMfm3hP7rIubuheQH9NWgojxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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