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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72651946ff132278121c3c515508750e11affd56ea82fd1f14fd7ccec0eaed0d' 
  AND token = 'V2kHo/oZZkrAVy25O8l7pFaJvXjz6Ib4H2qq9h87ckY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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