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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b70b223a621a56b56496b046d2886dc73090669adeaebe802576d792420a5bf' 
  AND token = 'oTZH6m1PL9Jq3v3JjocBGq7l1eNDw66eTe5r7Cu56Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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