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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4042c21083635817fefd92bbf2f58335e5960513097e27c197fcf662cf56a5e' 
  AND token = 'SL1HaRi2SI0fjSwP4V9NL+vTQaZ7oKB4NZ1+L6AT/1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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