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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32109aae925f6a3b6c00a50eb35e0169464813ff8977c49e9e6fc00c6699e15b' 
  AND token = 'OVBOAp76ok3hbwX9ixbIjS5RDTDCBbG8xe21BrDSsC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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