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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6808cdb2ea665b87d5d87e4198b506b812d9c072a0904bb4daff50ea107c044' 
  AND token = 'QNbsDupKgaQPhCdEqJ1lyd2UppZfpCkFP22Oj2BWTMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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