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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b2b4abfcb3770fd3904d80599eafa9f515d690d28d20aa79f44b32efa639e9' 
  AND token = 'c6NWbWJG4K72wk719ylCT2TiyK/KlIlnijGMwEh++TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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