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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ddfad9004769fd0c43eed8d584d75ded62ae4c6f99dae73c0a514ab9dbe450' 
  AND token = 'rXROBfGootGBeqigd0t6t1+Dhbs+PB2KfnPrsh+VcbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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