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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c7bf9eae3e4eb4b716b8682aac287470f194108f67a4b74fb84e65e755156b' 
  AND token = '1yMugU3HUAgcGgVFsBl1Q4kLol2kJ/bif0FrqoiEbnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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