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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b62bfb5b9d4b4515391c88c06852e8b63ffd38c707b538546faa06f5c01ed17' 
  AND token = 'Oh/MaaErw7WUs64F2wvJxUc6vZMSfSLpf0X7Y/rpAF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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