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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '281d532a3d507e4780c336f6bf075bfa2a38e6690e6584a6b8e0189e80be41c7' 
  AND token = 'abpPtL0Q7dS1g97ClhDA7EFI7P09ACgFHfUUIVa3VCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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