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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72301390d193f4680fb1dd56911fcd41530e0a6b7cf96cf070ceb63c94fe25e6' 
  AND token = 'FNbv/BsiAPpUGcroJbRN029fL3EcUgzPHFNAwaiT6Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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