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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db66a2f8e5675a0c229d757272bffb668ae497d5a9d3bbe52edd235fa5abc7f7' 
  AND token = 'WB1hTKxJAITodyRh4A+GmKf4M/+w8esXnUBzWQpI4BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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