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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '927b3ba1e11f1e4d8e7a83f8bd5532066fa0978f8f7be1a51cad0588549fb1a2' 
  AND token = 'fINwOdcxgVs0yVh+Gt2SI63ArOi+j729Ji9F2Z8pX6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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