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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bdcbd603042efe4180cb2825400fd857344ee31ad5dd0ba0f5baf4a733cc012' 
  AND token = 'S940vNHR5hbgpW4+4JpDv8RnAl3qe0B69hkxInzPxHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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