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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb5505700db9647b0bd4d85d5d977b8c8190d2c3b721d868b4e60db9295ce41' 
  AND token = 'd9yfxzGe6N0lqK9R0afCgu0KJIANY8UOsPeIvJk8mD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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