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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9239ce51d6d787346af5d5966a8f29c810c06e500b02e21760d586baf15915c' 
  AND token = 'u906GPB55+e9var1EjCW8RNNLC/krsEpNlO1t1yAxbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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