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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aedc00bb3d63ddd528b6009b98a69dbc5fb26f22dfbb78faf20320e3fb46b92' 
  AND token = '+jqqRh1jPBjjSlXMsKvQW7BpeZyolLyr1WCvxW1qB80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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