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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1dce6cd74b9fb0e52c514b0523ff8bb71d18d038edaf6a7d3f32a27c731cec1' 
  AND token = 'yMBu03cogBBTeonFvUIHAx69+je1ScBv21K9KyGT+7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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